NONLINEAR GROUP-CONTRIBUTION MODELS OF CORROSION INHIBITION

The correlation between the molecular structure and inhibitor efficien cy (E(i)) of triamines was investigated The group-contribution approac h was adapted to account for Langmuir- and Frumkin-type inhibition. Th e group contributions (a(j)) were obtained using a nonlinear regressio n technique. It was assumed that corrosion inhibition was proportional with coverage, which in turn was accounted for by the Langmuir and Fr umkin models of adsorption. The multiple correlation coefficient obtai ned by the linear group-contribution model was improved markedly by us ing adsorption models. On the basis of these results, a more efficient inhibitor molecule was proposed.